How to best fix dent in passenger side of fleetside 66 bed?

[msg]

First time tackling a dent like this, is there a way to remove the passenger side bed panel to try and fix this dent?




So I began by sanding the area




Then I tried using the welding dent puller gun that I bought at HF and the pins kept popping out when I tried using the body slide hammer tool and it left holes.



I guess the dent is so extreme that the dent weld puller wont help much.
I had better results when I placed a 2x4 inside the panel and used the bed frame for leverage and popped it out better






I think if I can get the panel off I can hammer/dolly it and maybe salvage the panel vs a new one.

I ordered a cd iof the 1966 assembly manual but it will take a few days to get here.
I see some bolts that face the cab that will I think begin to loosen the panel but the rest I cant seem to figure out.